Revert "RDMA/hns: Reserve one sge in order to avoid local length error"

Revert "RDMA/hns: Reserve one sge in order to avoid local length error"

This patch caused some issues on SEND operation, and it should be reverted
to make the drivers work correctly. There will be a better solution that
has been tested carefully to solve the original problem.

This reverts commit 8c4b3f373b1d67fe91a9192003c89fc152491a81.

Fixes: 8c4b3f373b1d ("RDMA/hns: Reserve one sge in order to avoid local length error")
Link: https://lore.kernel.org/r/1597829984-20223-1-git-send-email-liweihang@huawei.com
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>